update

node_modules/fs-extra/lib/util/stat.js

@@ -0,0 +1,172 @@
+'use strict'
+
+const fs = require('graceful-fs')
+const path = require('path')
+
+const NODE_VERSION_MAJOR_WITH_BIGINT = 10
+const NODE_VERSION_MINOR_WITH_BIGINT = 5
+const NODE_VERSION_PATCH_WITH_BIGINT = 0
+const nodeVersion = process.versions.node.split('.')
+const nodeVersionMajor = Number.parseInt(nodeVersion[0], 10)
+const nodeVersionMinor = Number.parseInt(nodeVersion[1], 10)
+const nodeVersionPatch = Number.parseInt(nodeVersion[2], 10)
+
+function nodeSupportsBigInt () {
+  if (nodeVersionMajor > NODE_VERSION_MAJOR_WITH_BIGINT) {
+    return true
+  } else if (nodeVersionMajor === NODE_VERSION_MAJOR_WITH_BIGINT) {
+    if (nodeVersionMinor > NODE_VERSION_MINOR_WITH_BIGINT) {
+      return true
+    } else if (nodeVersionMinor === NODE_VERSION_MINOR_WITH_BIGINT) {
+      if (nodeVersionPatch >= NODE_VERSION_PATCH_WITH_BIGINT) {
+        return true
+      }
+    }
+  }
+  return false
+}
+
+function getStats (src, dest, cb) {
+  if (nodeSupportsBigInt()) {
+    fs.stat(src, { bigint: true }, (err, srcStat) => {
+      if (err) return cb(err)
+      fs.stat(dest, { bigint: true }, (err, destStat) => {
+        if (err) {
+          if (err.code === 'ENOENT') return cb(null, { srcStat, destStat: null })
+          return cb(err)
+        }
+        return cb(null, { srcStat, destStat })
+      })
+    })
+  } else {
+    fs.stat(src, (err, srcStat) => {
+      if (err) return cb(err)
+      fs.stat(dest, (err, destStat) => {
+        if (err) {
+          if (err.code === 'ENOENT') return cb(null, { srcStat, destStat: null })
+          return cb(err)
+        }
+        return cb(null, { srcStat, destStat })
+      })
+    })
+  }
+}
+
+function getStatsSync (src, dest) {
+  let srcStat, destStat
+  if (nodeSupportsBigInt()) {
+    srcStat = fs.statSync(src, { bigint: true })
+  } else {
+    srcStat = fs.statSync(src)
+  }
+  try {
+    if (nodeSupportsBigInt()) {
+      destStat = fs.statSync(dest, { bigint: true })
+    } else {
+      destStat = fs.statSync(dest)
+    }
+  } catch (err) {
+    if (err.code === 'ENOENT') return { srcStat, destStat: null }
+    throw err
+  }
+  return { srcStat, destStat }
+}
+
+function checkPaths (src, dest, funcName, cb) {
+  getStats(src, dest, (err, stats) => {
+    if (err) return cb(err)
+    const { srcStat, destStat } = stats
+    if (destStat && destStat.ino && destStat.dev && destStat.ino === srcStat.ino && destStat.dev === srcStat.dev) {
+      return cb(new Error('Source and destination must not be the same.'))
+    }
+    if (srcStat.isDirectory() && isSrcSubdir(src, dest)) {
+      return cb(new Error(errMsg(src, dest, funcName)))
+    }
+    return cb(null, { srcStat, destStat })
+  })
+}
+
+function checkPathsSync (src, dest, funcName) {
+  const { srcStat, destStat } = getStatsSync(src, dest)
+  if (destStat && destStat.ino && destStat.dev && destStat.ino === srcStat.ino && destStat.dev === srcStat.dev) {
+    throw new Error('Source and destination must not be the same.')
+  }
+  if (srcStat.isDirectory() && isSrcSubdir(src, dest)) {
+    throw new Error(errMsg(src, dest, funcName))
+  }
+  return { srcStat, destStat }
+}
+
+// recursively check if dest parent is a subdirectory of src.
+// It works for all file types including symlinks since it
+// checks the src and dest inodes. It starts from the deepest
+// parent and stops once it reaches the src parent or the root path.
+function checkParentPaths (src, srcStat, dest, funcName, cb) {
+  const srcParent = path.resolve(path.dirname(src))
+  const destParent = path.resolve(path.dirname(dest))
+  if (destParent === srcParent || destParent === path.parse(destParent).root) return cb()
+  if (nodeSupportsBigInt()) {
+    fs.stat(destParent, { bigint: true }, (err, destStat) => {
+      if (err) {
+        if (err.code === 'ENOENT') return cb()
+        return cb(err)
+      }
+      if (destStat.ino && destStat.dev && destStat.ino === srcStat.ino && destStat.dev === srcStat.dev) {
+        return cb(new Error(errMsg(src, dest, funcName)))
+      }
+      return checkParentPaths(src, srcStat, destParent, funcName, cb)
+    })
+  } else {
+    fs.stat(destParent, (err, destStat) => {
+      if (err) {
+        if (err.code === 'ENOENT') return cb()
+        return cb(err)
+      }
+      if (destStat.ino && destStat.dev && destStat.ino === srcStat.ino && destStat.dev === srcStat.dev) {
+        return cb(new Error(errMsg(src, dest, funcName)))
+      }
+      return checkParentPaths(src, srcStat, destParent, funcName, cb)
+    })
+  }
+}
+
+function checkParentPathsSync (src, srcStat, dest, funcName) {
+  const srcParent = path.resolve(path.dirname(src))
+  const destParent = path.resolve(path.dirname(dest))
+  if (destParent === srcParent || destParent === path.parse(destParent).root) return
+  let destStat
+  try {
+    if (nodeSupportsBigInt()) {
+      destStat = fs.statSync(destParent, { bigint: true })
+    } else {
+      destStat = fs.statSync(destParent)
+    }
+  } catch (err) {
+    if (err.code === 'ENOENT') return
+    throw err
+  }
+  if (destStat.ino && destStat.dev && destStat.ino === srcStat.ino && destStat.dev === srcStat.dev) {
+    throw new Error(errMsg(src, dest, funcName))
+  }
+  return checkParentPathsSync(src, srcStat, destParent, funcName)
+}
+
+// return true if dest is a subdir of src, otherwise false.
+// It only checks the path strings.
+function isSrcSubdir (src, dest) {
+  const srcArr = path.resolve(src).split(path.sep).filter(i => i)
+  const destArr = path.resolve(dest).split(path.sep).filter(i => i)
+  return srcArr.reduce((acc, cur, i) => acc && destArr[i] === cur, true)
+}
+
+function errMsg (src, dest, funcName) {
+  return `Cannot ${funcName} '${src}' to a subdirectory of itself, '${dest}'.`
+}
+
+module.exports = {
+  checkPaths,
+  checkPathsSync,
+  checkParentPaths,
+  checkParentPathsSync,
+  isSrcSubdir
+}